"On Calligraphy and French Volume" paper version, cursive script, length 24.8 cm, width 273.6 cm, collected by Nanjing Museum. It is an incisive book review by the author. This work uses a bare pen to gain strength, and the strokes are smooth and changeable. The signature at the end of the volume is sixteen characters. It is a masterpiece of Cai's later years.
